Body dumping mechanism



Feb. 20, 1940. H. c. FRENTZEL, R, Em. 2,190 8w BODY DUMPING MECHANISM Filed April 20, 1939 2 Sheets-Sheet 1 I We. MOlRNEY.

Feb. 20, 1940. c. FRENTZEL, JR., Er AL 2,190,87@

BODY DUMPING MECHANISM Filed April 20, 1959- 2 Sheets-SheetZ Patented Feb. 20, 1940 UNITED STATES rTENT osrics BODY DUMPING MECHANISM Herman C. Frentzel, Jr., Shorewood, and Carl G.

Novotny, Milwaukee, Wis, assignors to The Hell 00., Milwaukee, Wis., a corporation of Wisconsin Application April 20, 1939, Serial No. 268,882

8 Claims. (o1. 298-22) vention is to provide an improved vehicular load carrying body dumping assemblage, which is simple and durable in construction, and which is also highly effective in use. It has heretofore been common commercial practice to tiltably mount a load carrying body on a vehicle, and to utilize a hydraulic jack or hoist for tilting the body to dump the load therefrom. Many and varied types of mechanisms for transmitting motion from the hoist to the body and for converting the reciprocating motion of the jack piston into oscillatory movement of the body, have also been proposed and utilized with 20. more or less success. One such prior mechanism is disclosed in Patent No. 2,136,231, granted November 8, 1938, wherein the load carrying body and the hoist cylinder are pivotally suspended respectively from the rear and front portions of the chassis frame and the outer end of the hoist 2 plungeror piston rod coacts with a crosshead which is directly pivoted to side lifting arms swingably mounted upon the frame and having guide rails which coact with rollers carried by the body so as to swing the latter about its pivot when thehoist is operated. While the use of such rollers riding upon laterally separated side lifting arms or levers of this type to swing the body about its pivot, is desirable, it has also been found desirable in order to prevent excessive wear on the lever pivots and on the hoist parts, to provide a certain amount of flexibility between the hoist and the body tilting arms or levers, so that when the body is not uniformly loaded as is frequently the case, the laterally separated lifting arms may deflect or move slightly and independently of each other without excessively stressing the pivotal connections between these arms and the hoist parts. This will prevent uneven loading of the body from buckling or bending'the hoist plunger or piston rod, and will permit the piston and its rod to maintain its parallel direction of travel with respect to the cylinder, thus eliminating rapid wear on the rod, piston and 50 cylinder.

The present invention, therefore, has for its object, the provision of an improved, motion transmitting mechanism interposed between a fluid pressure actuated jack and a tiltable body,

5 which will positively prevent excessive wear on the relatively reciprocable parts of the jack due to off-center or unequal loading of the body.

A more specific object of the invention is to provide a simplified hydraulically actuated body 30 dumping mechanism of the general type disclosed in the above identified patent, but wherein the hoist elements are not directly attached to the side levers and are thus effectively relieved from abnormai stresses.

Another specific object of our invention is to provide a new and useful body dumping mechanism of the type wherein laterally spaced simultaneously swingable side arms or levers coact through guide rails and rollers with the tiltable body, and are swingable in union by means of a single intervening fiuid pressure actuated jack having flexible association with the levers remote therefrom.

Still another specific object of this invention is to provide a quick acting, powerful and durable body dumping assemblage, which can be readily applied to a vehicle and which may be manufactured and sold at moderate cost.

These and other specific objects and advantages of the present invention will be apparent from the following detailed description.

A clear conception of an embodiment of our invention and of the mode of constructing and of operating a body dumping mechanism built in accordance with our improvements, may be had by referring to the drawings accompanying and forming a part of this specification wherein like reference characters designate the same or similar parts in the various views.

Fig. l is a side elevation of one of the improved vehicular dump body assemblages, showing the dump body disposed in normal horizontal load carrying position;

Fig. 2 is a similar viewof the assemblage, showing the load confining body in extreme tilted position;

Fig. 3 is an enlarged part sectional plan view of the motion transmitting mechanism, the dump body having been removed and only a fragment of the actuating hoist being shown;

Fig. 4 is a similarly enlarged side elevation of the improved motion transmitting mechanism, as viewedalong the line i l of Fig. 3; and

Fig. 5 is a transverse section through one of the side levers and the adjacent body beam, the

section being taken along the line 5-5 of Fig. 4.

tiltably supported upon the rear of the chassis 8 the forward portion of an auxiliary frame l5- which is rigidly supported upon the vehicle chassis 8, and the frontportion of the frame l5 is provided with a transverse beam I6 upon which i the front ends of the lower body reenforcing beams ll are adapted to rest when the body H] is in normal load carrying position as shown in Fig. 1. The body beams I! are ordinarily located beneath and near the opposite sides of the body It, and the body may be additionally strengthened by means of other beams andframing as shown. The rear of the body I may also be provided with the usual end gate for confining the load therein, and this gate has been omitted from the disclosure.

As previously indicated, the hydraulic hoist cylinder I3 is swingably suspended from the frame l by means of trunnions l4, and a pump l8 which is operable from the propelling motor of the vehicle and which is associated with the lower end of the cylinder l3 near the tru'nnions M, is adapted. to supply liquid such as oil under pressureto the piston displacement chamber. The hoist plunger or piston i9 is reciprocable in the cylinder l3, and has a piston rod 20 which penetrates the upper cylinder head 2| and is provided with a connector or fitting 22 having a transverse opening 23 therethrough which is constricted at its center and enlarged at both ends as clearly illustrated in Fig. 3. The fitting 22 is rigidly attached to the outer extremity of the piston rod 20, and the fitting 22, rod 20 and piston iii are reciprocable relative to the cylinder it but are swingable therewith about the axis of the trunnions I4.

Swingably suspended from the auxiliary frame it rearwardly of the trunnions l4 and forwardly of the pivot l2, are two laterally separated side arms or levers 24 which are located in prox-' imity to the body beams I 'I, and are interconnected at their lower pivoted ends by means of a transverse box beam 25 formed of heavy metal plate. The levers 24 are swingably suspended from the fixed frame l5 by means of a pivot shaft 26 the outwardly projecting ends of which are journaled in bearings 21 secured to the side beams of the frame'l5; and the transverse beam 25 is provided at its medial front portion which two spaced ears 28 in which a pivot pin 29 is fixedly anchoredby a locking pin 30. The pin 29 coacts loosely with the reduced central portion of the opening 23, in the piston rodfitting 22, asshown in Fig. 3, and itis noteworthy that the pin 29 is located remote from the side levers 24 and from the lever pivot shaft 26. The lower 1 front portions of the levers 24 are provided with rigid parallel rails 3! along which rollers 32 are adapted to travel, and these rollers 32 are journaled on side brackets 33 which are firmly attached to the adjacent body beams H, see Figs. 3, 4 and 5. The rails 31 are rigidly attached to their carrier levers 24 by means of ribs 34 and end stops 35, and the auxiliary frame I5 may be provided with side guide plates 36 for guiding the front portions of the beams l'l during lowering of the body in.

When assembling our improved body dumping mechanism, the hoist and the lever assemblage may be mounted upon the auxiliary frame l5 to form a unitary structure which may be handled as a unit and app-lied as such to a standard vebeam [6, the rollers 32 are disposed at the rear ends of the lever rails 3 I and the hydraulic hoist is contracted or in lowered position, as illustrated in Fig. 1. When it becomes desirable to dump or tilt-the body I0 about its rear pivot I2, the pump I8 may be operated to introduce liquid under pressure into the lower piston displacement chamber of the cylinder I3, whereupon the hoist will be expanded or distended. The piston l9 and rod will then travel upwardly toward the position shown in Fig. 2, causing the levels 24 to swing about the pivot shaft 26, and simultaneously causing-the body rollers 32 to advance along the lever rails 3i whereby the levers become efiective to gradually tilt the body H! with increasing leverage and speed. During this tilting of the body l0, it swings about the rear pivot 12, while the hoist cylinder l3 simultaneously swings about thetrunnions hi and the pivot pin. 29 revolves within the fitting opening 23. In order to lower or return the body ID to normal transporting position, it is only necessary to release the liquid pressure in the cylinder [3, whereupon the weight of the body M will force the piston l9 and rod 20 downwardly thus causing the rollers 32 to travel rearwardly along the lever rails 3i and returning the hoist and the levers 24 to lowered position as in Fig. 1.

If the body Ill is not uniformly loaded, and a major portion of the load is at one side of the central plane of the body and hoist, one of the levers 24 will naturally be subjected to greater pressure than the other. The more heavily loaded lever 24 will then tend to distort, but the box beam will prevent relative displacement of the two side levers 24 and will thus hold these levers in proper alinement, thereby preventing distortion in the body due to unequal loading. This will cause the pivot pin 29 to tilt slightly within the loosely fitting opening 23, and due to the special formation of this opening with enlarged end portions, this tilting of the pin 29 will not tend to throw the piston l9 and' rod 20 out of true alinement with the cylinder 13, and head 2|. The cylinder l3, piston l9 and rod 28 are thus effectively protected against excessive wear due to such distortion or wearing of the lever assembly resulting from abnormal or unequal loading of the body Hi.

From the foregoing detailed description, it will be apparent that our present invention provides an improved body dumping mechanism which is I simple-and durable in construction and which is moreover highly efiicient in operation. By utilizing spaced side levers 24 operable by a single intermediate hoist, and by causing the rollers 32, which are carried by the body It, to coact with rails on the levers 24, the body In may be readily tilted without necessity of applying excessive power during starting, and the tilting action will become more rapid as the body I0 reaches its finally tilted position. The special formation of the fitting 22 andits coaction with the pivot pin 29 is obviously such that the parts of the hydraulic hoist are protected to 151-.

the maximum extent, even when the body H] is not uniformlyloaded. The levers 24 are of eX- to conventional trucks. The entire mechanism is obviously so simple that it may be manufactured and sold at moderate cost, and the improved lever mechanism has proven highly successful and efiicient in actual commercial use.

It should be understood that it is not desired to limit this invention to the exact details of construction or to the preciseimode of use, herein shown and described, for various modifications within the scope of the claims may occur to persons skilled in the art.

i We claim:

1. A dump body assemblage comprising, a vehicle chassis having a dump body pivotally associated therewith, an auxiliary frame mounted upon said chassis and having a hoist pivotally associated therewith, lifting levers; disposed at the opposite sides of said body, and pivotally mounted upon said frame and having rails forming trackways, brackets secured to said body in proximity to said levers and having thereon rollers which, are movable along said trackways, a transverse, beam rigidly interconnecting said levers and having a pivot pin rigidly attached thereto, and a fitting connecting the movable member of said hoist with said pin, said fitting being formed to permit lateral tilting of said pin without subjecting said hoist member to lateral stress due tosaid tilting.

2. A dump body assemblage comprising, a vehicle chassis having a dump body tiltably associated therewith, a hoistfswingably associated withsaid chassis beneath said body and having a lifting member movable toward the body, lifting levers pivotally associated with said chassis near the opposite sides of said body and havingtrzickways extending away from the pivots thereof,

rollers carried by the opposite sides of said body and coacting with said trackways, means rigidly interconnecting said levers hear the pivots thereof and having a rigid pivot bearing thereon remote from said levers, andia fitting carried by said lifting member and being loosely journaled on said bearing. i

3 A dump body assemblage comprising, a vehicle chassis having a dump body tiltably associated therewith, a hoist swingably associated with said chassis beneath said body and having a lifting member movable toward the body, lifting levers pivotally associated with said, chassis near the opposite sides of said body and having trackways extending away from the pivots thereof, rollers carried by the opposite sides of said body and coacting with said trackways, a transverse beam rigidly interconnecting said levers chassis and having a lifting member movable upwardly toward said body, lifting levers pivrectilineal trackways extending away from the pivots ofsaid levers, rollers carried by said body remote from its axis of tilting and coacting with said trackways, means rigidly interconnecting said levers and having a pivot bearing thereon,

between said levers, and a fitting carried by said lifting member and being loosely journaled on said bearing.

5. A dump body assemblage comprising, a vehicle chassis having a dump body tiltably associated with the rear end thereof, a hoist swingably associated with a forward portion of said chassis and having a lifting member movable upwardly toward said body, lifting levers pivotally associated with said chassis and having rectilineal trackways extending away from the pivots of said levers,irollers carried by said body remote from its axis of tilting and coacting with said trackways, a transverse beam rigidly interconnecting said levers and having a pivot bearing rigidly attached thereto remote from said trackways, and a fitting carried by said lifting member and having a journal opening loosely embracing said bearing. i u

6. A dump body assemblage comprising, a vehicle chassis having a dump body tiltable thereon, a hydraulic hoist swingably associated with said chassis and having a piston rod movable toward said body, lifting levers pivotally mounted on opposite sides of said chassis near the opposite sides of said body and having elongated guideways therein, rollers carried by the opposite sides of said body and coacting with said guideways, a rigid transverse connection between said levers, a

, pivot pin rigidly attached to the medial portion of said connection remote from said guideways, and a fitting carried by said piston rod and having a journal opening embracing said pivot pin, said opening being constricted at its center and enlarged at its opposite ends.

"7. A dump body assemblage comprising, a vehicle chassis having a dump body tiltably associated therewith, a hoist swingably associated with said chassis beneath said body and having a lifting member movable toward the body, lifting levers pivotally associated with said chassis near the opposite sides of said body and having trackways extending away from the pivots thereof, guide means associated with the opposite sides of said body and coacting with said trackways, means rigidly interconnecting said levers near the pivots thereof and having a rigid pivot bearing thereon between said levers, and a fitting carried by said lifting member and being loosely journalled on said bearing.

8. A dumpbody assemblage comprising, a V6- hicle chassis having adump body tiltably associated therewith and comprising a main chassis frameand an auxiliary frame detachably mounted upon the main frame, a hoist tiltably assoelated with said auxiliary frame beneath said body and having a lifting member movable toward the body, lifting levers pivotally associated with said auxiliary frame near the opposite sides of said body and having trackways extending away from the pivots thereof, guide means associated with the opposite sides of said body and coacting with said trackways, means rigidly interconnectingsaid levers and having a rigid pivot bearing thereon between said levers, and a fitting carried by said lifting member and being loosely journalled on said bearing. i e

HERMAN C. FBENTZEL, JR. CARL G. NOVOTNY.

otally associated with said chassis andhaving 

